Foot ski



FIG. 1 is a three-quarters perspective view of a foot ski showing my new design;

FIG. 2 is a front elevational view of my new design;

FIG. 3 is a rear perspective view showing my new design for a foot ski;

FIG. 4 is a rear and bottom three-quarters perspective view of my new design; and

FIG. 5 is a right side elevational view of my new foot ski.

The left side view of my design for a foot ski is a mirror image of the right side view. 

The ornamental design for a foot ski, substantially as shown and described. 